Barking drum



G. A. KOEBKE BARKING DRUM July 16, 1940.

Filed June 18, 1958 3 Sheets-Sheet l INVENTOR. 6604 66 4 [@5516 G. A. KOEBKE Filed June 18, 1938 3 Sheets-Sheet 2 INVENTOR. Q fa /Va RIEYS y 16, 1940. G. A. KOEBKE 2,208,004

BARKING DRUM iggg 911938 3 Sheets-Sheet .5

I 4 INVENTOR.

BY 640/? d fiaaw Mk flaw aroma Patented July 16, 1940 BARKING DRUM George A. Koebke, Manitowoc, Wis, assignoi' to Manitowoc Shipbuilding Company, Manitowoc,

Wis.

Application June 18, 1938, Serial No. 214,449

3 Claims.

This invention relates to barking drums.

In certain industries, for example in paper making, it is desirable to have the bark removed from logs or blocks of wood and barking drums are ordinarily provided for this purpose, the logs being fed in at one end of the rotating drum consisting of one or more sections and being discharged at the other end thereof. During their passage through the drum, the logs are tumbled over each other and against the sides of the drum and the dislodged bark falls through longitudinal openings in the drum.

Heretofore it has been the usual practice to use riveted or bolted constructions and it has been found that the severe stresses to which these drums are subjected frequently results in a twisting or other distorting of the drum. This is particularly so when portions of the wood become wedged between the drum and a stationary portion of the apparatus and at this time very severe stresses are placed on the drum frequently sufiicient to loosen many of the riveted or bolted joints. Additionally when it is considered that these drums are relatively long and are of cage like construction, it is apparent that it is difficult to provide a sturdy, rigid structure, for the constant jarring and straining of the drum results in loosening of the riveted or bolted joints.

This invention is designed to provide a barking drum which is of novel construction and so made that relatively long joints or contacts are provided at spaced intervals along and around the drum so that the tendency of one portion of the drum to shift with reference to another portion, as in twisting for instance, is very materially reduced.

In greater detail objects of this invention are to provide a barking drum in which spacing blocks or other spacing members are welded between channel irons or other structural members, in which the welded joints at each of the spacing members are so made that relatively Widely spaced welded joints are obtained and are spaced radially of the drum so that a very strong joint is obtained and one that will resist separation to a remarkable degree due to the spacing of the portions at which the welding has taken place for each spacing block.

A further object is to provide a welded construction for a barking drum in which the welded joints are protected to a considerable extent due to the manner in which the welded joints are formed and are related to other portions of the apparatus.

Further objects of this invention are to provide a novel means of attaching the driving gear ring or the tires to the barking drum. When it is considered with reference to the driving ring that this driving ring transmits the entire power for rotating the drum and that severe and suddenly applied strains are frequently imposed on this driving ring, it is at once apparent that there is considerable tendency for the heretofore known saddle members which attach the driving ring or tires to the longitudinal bars of the barking drums, to rock or become dislodged or loosened.

A further object of this invention is to provide a novel means of attaching the driving gear ring or the tires to the barking drum whereby great strength is provided by the attaching memher to resist the rocking motion even when a considerable driving strain is transmitted from the driving ring gear to the barking drum. 4

A further object is to provide a novel means of connecting the driving ring to the barking drum in such a manner that very accurate positioning of the driving ring is obtained so that accurate meshing of the teeth of this driving ring with its corresponding driving pinion is obtained, the construction allowing a slight in and out or radial adjustment of the driving ring during assembly so that perfect meshing of the teeth of the ring gear and driving pinion are obtained.

Further objects are to provide a novel construction of barking drum in which the spacing blocks shield the tires and gear ring from bark and also from water, if a spray is used.

Embodiments of the invention are shown in the accompanying drawings, in which:

Figure 1 is a plan View, partly broken away of a barking drum with most of the mechanism customarily associated therewith omitted.

Figure 2 is an enlarged sectional view through an end portion of the ring and through one of the channel members.

Figure 3 is a line section on the line 3-3 of Figure 2 showing one form of spacer block and welded construction.

Figure 4 is an enlarged sectional view showing one manner of welding a spacing block in place between adjacent channel members and showing a different form of spacing block.

Figure 5 is a view corresponding to Figure 4 showing a further method of welding a spacing block in place and showing a different form of spacing block.

Figure 6 is a View corresponding to Figure 4 I gear to the barking drum.

Figure 11 is a fragmentary view showing the manner in which the barking drum is supported on self-adjusting rollers and showing also the relative position of the tire and the saddles which attach it to the barking drum.

Figure 12 is a fragmentary sectional View on the line I2I2 of Figure 11.

Figure 13 is a fragmentary view showing the manner in which the driving ring gear is attached to the barking drum.

Figure 14 is a sectional view on the line l4-I4 of Figure 13.

Figure 15 is a fragmentary view showing a further way in which the tire or driving ring gear may be attached to the barking drum.

Referring to the drawings, it will be seen that the barking drum comprises a plurality of chan nel members I which extend longitudinally of the drum and are spaced apart to provide spaces therebetween indicated by the reference character 2 for the escape of bark.

Spacing blocks or spacing members 3 are provided between successive channel bars and these spacing blocks are arranged in annular zones around the drum, several Zones being provided as indicated, for example, in Figure 1. As shown in this figure, one zone or set of spacing blocks 3 is provided for each of the tires or tire rings 4 and one set for the driving ring gear 5, and at additional points as may be found desirable, for instance at the ends of each section as indicated at 3'.

The driving ring gear 5 may be driven from a pinion 6 from any suitable source of power in the usual manner. The tires 4 may rest upon selfadjusting pairs of flanged rollers 1, see Figure 11, which may be carried in the usual manner upon pivoted members 8 to provide the self-adjusting feature for the rollers. These rollers support the weight of the drum but no driving force is transmitted to these tires, the entire driving force for rotating the drum being transmitted to the driving ring gear 5, see Figure 1.

Several different arrangements of spacing blocks have been shown in Figure 1. For instance, adjacent the tires the spacing blocks 3 may be staggered as shown or may be uniformly positioned. The staggered construction gives a slightly added rigidityto the drum structure as it in effect extends the welded joint hereinafter described a greater axial length or longitudinal length of the drum than if all of the spacing blocks 3 adjacent a tire, for instance, were positioned in exactly the same relative place. Again, as shown for instance adjacent the driving ring gear, the spacing blocks 3 may be of the same or different lengths. For instance, at regular intervals a relatively long spacing block 3 may be provided. Every other spacing block in Figure 1 has been shown as long.

- The longer the spacing blocks are adjacent the driving ring gear or adjacent the tires, the greater is their shielding effect in preventing falling bark or spray, if spray is used, from contacting the driving ring gear or the tires.

The long spacing blocks are employed to increase the rigidity or strength of the structure. For instance, if they are longer than would be needed if used throughout the entire construction, it is obvious that increased rigidity could be obtained by using long spacing blocks at regular intervals instead of. completely around the barking drum. In this way relative shifting of the different parts of the drum is materially reduced.

These spacing blocks 3 are welded to the adjacent structural sections or channel members I in a novel manner. They may be bevelled out as indicated at 9 and II! in Figure 3, and the welded seams I I and I2 may be formed at these bevelled out portions, thus having the inner surfaces of the blocks and the welded joints I I flush with the inner surface of the barking drum and having the welded joints I2 set inwardly of the outer edges of the flanges of the channels I to thus both protect the joints from mechanical injury and from excessive strains.

It is to be noted that these welded seams extend the full length of each of the spacer blocks and thus a very long longitudinally extended joint for successive bars is provided which greatly reduces any chance of torsional or other distortion of the barking drum, even when subjected to unusual stresses.

From reference to Figure 3 it will be seen that the radial spacing of the welded seams or joints II and I2 carries out the efiect of the flanges of the channel members I, that is to say, they greatly increase the strength of the structure due to their radial spacing.

Another feature to be noted with reference to Figure 3 is that the outer seams or welded joints [2 are spaced inwardly from the outer edges of the flanges of the channel members I with a resulting smaller concentration of stress at the welded construction.

The welded spacer blocks 3 or spacer members are tapered slightly so as to conform to the cylindrical contour for the entire barking drum.

When it is considered that riveted joints provide a point to point attachment, whereas the welded seams formed on the elongated spacing blocks provided extensive longitudinal areas which are rigidly welded and which therefore do not provide merely a point to point joint but a longitudinally extended joint which very greatly reduces any possible chance of relative motion between successive channel members, it will be seen that this novel construction greatly increases the rigidity of the structure and the strength of the structure.

End rings I3, see Figure 2, may be provided at opposite ends of the drum and may be welded to the ends of the channel members I by means of the inner and outer welded joints I4 and I5, the outer joint I5 extending across the web of the channel member and along the flanged portions, as shown in Figure 2. Preferably a reenforcing inner ring I6 is welded to the inner peripheral edge of the rings I3 and it is also preferable to bevel the inner peripheral edges of the rings I3, as indicated at IT, in Figure 2, and to form the welded seams I8 within the resulting recessed or cut-out portions, as shown in Figure 2.

Saddle members or saddles I 9 may be provided cal channel members I and are secured thereto in any suitable manner, as for example by means of. welding as indicated in Figure 2. The saddle members are bolted to the flanges of the tires, as shown in Figures 11 and 12.

The spacing members or spacing blocks may take several forms. A few of them have been illustrated. For example as shown in Figure 4, a further form of spacing block 20 is provided in which the beveled or cut out portions 2! are formed only on the inner corners of. the spacing block. Welded joints 22 are formed at these beveled or cut out portions and the inner welded joints 22 and inner face of the spacing member are flush with the inner surface of the barking drum.

The outer end of the spacing block 20 terminates short of the flanges of the channel members I as shown and welded joints 23 are provided without forming cut out portions at these outer corners of the spacing blocks. These welded joints 23 are still housed or set inwardly of the outer ends of the flanges and as described in connection with Figure 3, there is less chance of cracking open than if the outer corners of the spacing blocks were flush with the outer corners of the flanges of the channel. sections I.

A further form of spacing block is shown in Figure 5 and indicated by the reference character 24. This form of block is a tapered wedge like member without any cut outs whatsoever. The

inner welded seams or joints 25 overlap the inner corners of the spacing blocks and the adjacent bars or channel members I. The outer welded seams or joints 26 may be as described in connection with Figure 4, or maybe as shown in Figure 3. The welded seams .25 provide inward projections which may be desired under certain conditions to assist in removing bark. They provide a certain degree of roughness at diiferent points around and along the interior of the barking drum.

If it is desired to provide larger projections or those that extend inwardly to a greater radial distance, the form of spacing block shown in Figure 6 and indicated by the reference character 2'! may be used. This spacing block has a projecting head or inner end portion 21 which may be rounded as indicated or may take other shapes.

This inward portion 21' extends inwardly a material distance beyond the inner periphery of the barking drum. It may be provided with recessed or cut out portions 28 at which welded joints 29 are formed. Theouter welded joints 36 may be as indicated in Figure 6 and may cor respond to that shown in Figure 4, or may be of the form shown in Figure 3 if desired.

If it is desired to reduce the total weight added by the several spacing blocks, the form of con struction shown in Figure 7 may be employed in which the spacing block 3! takes the shape of an I-beam, the flanges being tapered to give the tapering effect as previously described. The outer welded seams are indicated at 32 and may be, as shown in Figure 7, like the seams 23 of Figure 4 or may be like the seams shown in Figure 3 and indicated by the reference character I2 in such figure. The inner flange of the I-beam spacing block or spacing member til may be joined to the adjacent channel members by the welded seams 33 corresponding to those shown in Figure 5 and indicated by the reference character 25. This form of welding seam has been shown in Figure '7. However, the inner seams may be as shown in Figure 4 and indicated by the reference character 22 if desired.

A further form of spacing block is shown in Figure 8. In this form the spacing block 33 extends beyond both the inner and the outer portions of the flanges of the channel members or bars I. It may have the outer and inner welded seams formed as indicated at 39 and 10 or, if desired, welded seams as indicated at 29 in Figure 6 may be provided.

One of the principal points to be noted in reference to these spacing blocks is that the inner and outer welded seams are spaced apart a material distance so as to give the effect of a structural shape, for example more of the order of a girder construction, in which the upper and lower points of attachment provide great strength against distortion due to their wide spacing. Additionally in all of the forms shown, it is to be understood that these'are merely illustrative of the many difierent shapes that the spacing members may take and at this point it is to be noted also that although channel members I are preferably provided for the longitudinally extending bars of the barking drum, that 1 other shapes can be used without departing from the spirit of this invention.

It is to be noted with reference to the supporting members I9 or saddles for the tire or roller rings 4, that these members are welded, as shown in Figure 9 and as indicated by the reference character M, to the channel members or bars I.

However, as shown in Figures 11 and 12, the tires i are detachably secured by means of bolts 35 to these saddle members so that when the tires become badly worn, they may be detached. The saddle members I9 are shown as of the usual type. They may be secured by riveting, welding, or any other means, welding however having been shown. However, these saddles may be like the saddles for the ring gear hereinafter described and illustrated particularly in Figures 10, 13 and 14.

The saddle members or saddles for the ring gear 5 are indicated in Figures 10, 13 and 14 by the reference character 36. They are approximatelyU-shaped members and have inwardly extending flanges 38' which abut the inner surfaces of the flanges of the bars or channel members I and are welded thereto. They may be provided with a reenforcing web 31, as shown most clearly in Figures 10 and 14, such web being welded to the flanges 36 and the body of the saddles 36, as shown in Figures 10 and 14. The flanges of the ring gear are bolted tothe body portion of the saddles 36 and preferably the ring gear is made in sections which are bolted together, as shown in Figure 13. It is to be noted that the saddle members or saddles 36 do not abut the web portion of the channel members i but contact the inner surfaces of the flanges thereof. They may thus be adjusted inwardly or outwardly of the channel members I to cause accurate meshing of the teeth of the ring gear 5 with the teeth of the driving pinion 6. When this adjustment is once obtained, the members 36 are securely welded to the flanges of the channel members or side bars I of the barking drum.

If desired, spacing shims or filler plates 4|, see Figure 15, may be positioned between the tires 4 as shown or between the ring gear and the saddles 36, the saddles 3% being however welded to the members I, as previously described. This last construction facilitates operations in the field away from the shop.

In addition to the above beneficial features, due to the peculiar construction of the members 36 they have considerably more strength against displacement from the driving force transmitted by the driving ring gear 5 to the barking drum. There is much less chance for these saddle members to rock when an extreme amount of power is transmitted from the driving gear to the drum than the form of saddle members heretofore employed and as illustrated at I!) in Figure 12. The saddles in the old practice were riveted to the channel members but occupied the position as shown in Figure 12. If the old type of saddle member were employed, there is a considerable rocking strain imposed thereon which has frequently been known to loosen these saddle members from their corresponding side bars. However, in the form shown in Figures 10, 13, 14 and 15, the saddle members or saddles 36 for the driving ring gear have widely spaced front and rear portions considering the direction of rotation of the driving gear, and these widely spaced portions are securely welded to the flanges of the channel bars. There is thus very little chance of rocking the saddles 36 due to driving force transmitted from the driving ring gear 5 to the barking drum.

It will be seen that in addition to any bracing or strengthening efiect that may be imparted to the barking drum by the surrounding tire rings and driving ring gear, that the major portion of the strength of the barking drum is obtained from the composite manner in which the barking drum is made up. The strength of the barking drum forming the subject matter of this invention is not dependent as heretofore on any internal or external bands to which the longitudinally extending channel bars are attached, but is obtained by the co-relation of the spacing blocks and the longitudinally extending bars which together form a fabricated structure of a plurality of distinctly separate parts which are united by welding to form a unitary whole.

It is'to be noted that whatever strength is obtained from the tires and driving gear being bound or connected to the longitudinally extending channel bars is retained in the present structure as heretofore, but that the major strength far in excess of that hereina'bove mentioned is obtained due to the peculiar manner in which the barking drum is made. It is to be particularly noted that this invention provides a way of making a very rigid and strong barking drum from a plurality of individual parts, namely, the longitudinally extending channel members and the spacing members or spacing blocks. In other words, the barking drum is built up structurally from a plurality of individual parts which, due to their being joined by welding in a rigid unitary structure, produce in themselves without the assistance of rings or other members a cylindrical structure of great strength and rigidity.

It will be seen that a novel barking drum construction has been provided by this invention which is very strong and rigid and which successfully resists torsional distortion or other distortion, in which the parts will not loosen during use, and in which a very economical way of constructing the drum has been provided.

Although this invention has been described 'in considerable detail, it is to be understood that such description is intended as illustrative rather than limiting, as the invention may be variously embodied and is to be interpreted as claimed.

I claim:

l. A substantially cylindrical barking drum comprising two series of members which jointly of themselves and independently of other agencies maintain the substantially cylindrical contour of the barking drum when the barking drum is subjected to stresses incident to normal operation, one series of said members consisting of longitudinally extending channel bars having radially extending flanges with the channels of said bars opening outwardly, the other series of members consisting of connectors positioned between successive bars and welded to the radially extending flanges of said bars at inner and outer radially spaced points and providing direct connecting zones extending straight across from bar to bar along radially spaced planes through said connectors, a plurality of U-shaped saddle members having the arms of the U-shaped saddle members telescoping with the channels of said bars and welded to the flanges of said bars, and a driving ring gear detachably secured to said saddle members.

2. A substantially cylindrical barking drum comprising two series of members which jointly of themselves and independently of other agencies maintain the substantially cylindrical contour of the barking drum when the barking drum is subjected to stresses incident to normal operation, one series of said members consisting of longitudinally extending channel bars having radially extending marginal flanges with the flange of one bar spaced from the flange of the succeeding bar, the other series of members consisting of connectors joining successive bars and welded to the bars at inner and outer radially spaced points and providing direct connecting zones extending straight across from bar to bar along radially spaced planes through said connectors, whereby the stresses incident to the normal operation of the drum are directly transmitted from bar to bar through the corresponding connecting member along radially spaced planes.

3. A substantially cylindrical barking drum comprising two series of members which jointly of themselves and independently of other agencies maintain the substantially cylindrical contour of the barking drum when the barking drum is subjected to stresses incident to normal operation, one series of said members consisting pf longitudinally extending channel bars having radially extending flanges with the channels of said bars opening outwardly, the other series of members consisting of connectors positioned between successive bars and welded to the radially extending flanges of said bars at inner and outer radially spaced points and providing direct connecting zones extending straight across from bar to bar along radially spaced planes through said connectors, a plurality of saddle members fitted to the radially extending flanges of said channel bars and welded to said flanges, and an annular tire member detachably secured to said saddle members.

GEORGE A. KOEBKE. 

